Be ce a eS 
eae EO oe 
ie 
, eee 
by Weighing a globe previously exhausted and then filled oiett 
it, | obtained a result ranging from ‘570 to ‘580 somewhat below 
that given as characterizing good gas. But in reality I attach 
very little importance to this result since the mere specific gravi- 
ty of such a complex mixture as coal gas can haidiy be relied 
‘pon to determine its commercial value. 
Although good gas certainly has a higher specific gravity than 
Poor, yet the difference could not be taken to represent the true 
difference in value since the principal components of the mixture 
yarogen 
e's and other still heavier hydrocarbons having specific gravi- 
hes, widely different, might vary somewhat in their relative pro- 
en 
aside, attention Pp 
aury. to what extent will the illuminating power of the gas 
Mor by keeping it in contact with water for noted periods. 
wat it does deteriorate when thus kept, or when kept in contact 
With oil or even close vessels has been long known. 
Ut. Ure tells us that gas from oi] when first made and with a 
oe gravity of 1-054 will give the light of one candle when 
_ ,wtaed from jets consumin 
. re 
Sa urner you must supply 600 cubic inches per hour. 
He adds that with coal gas dee denexloretion appears to be more 
psi ae such gas when first made will give the light of 
